The invention relates to a three-wire rotary controlled-speed wire feeding machine comprising a casing and a frame. An active wheel bearing bracket is arranged on the frame. A wire-feeding active wheel set is arranged on the active wheel bearing bracket. Guiding plates are arranged on two sides of a wire-feeding active wheel, a pressing controlled-position controlling apparatus is arranged on the lower surface of the casing. A wire-feeding wheel driven wheel set is arranged on the pressing controlled-position controlling apparatus. A motor is arranged on the bottom of the casing. A motor chain gear on the motor is connected to a transmission gear on the active wheel bearing bracket through a chain. A wire feeding rack is fixed on the outer side of the casing. A three-angle wire-feeding plate is arranged on the casing through a rack. A slide rail is also arranged on the casing. A slide way slide block is arranged in the slide rail. The slide way slide block is connected with the three-angle wire-feeding plate through a rocking arm. With the machine provided by the invention, the wire-feeding angle can be changed, such that wire-feeding can be carried out more uniformly. The whole equipment is advantaged in simple structure, less fault points, easy maintenance, small friction, and low noise pollution. With the equipment, wire blocking and wire breaking can be prevented.